Tap on the "Gift" icon to send Gifts to and request Gifts from your Facebook friends.

IMPORTANT: Gifts you send to friends are not taken from your Joker or Chip balance. When you send Chips and Jokers to friends, it has no impact on your Joker or Chip balance.
Please note that Wordox on PC (played directly through Facebook) and the Wordox Mobile app on your smartphone/tablet are two different applications and you cannot exchange Gifts between these games.